cc: Remove forbidden using namespace directives.

cc/layer_quad_unittest.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 
 #include "cc/layer_quad.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/quad_f.h"
 
-using namespace cc;
-
+namespace cc {
 namespace {
 
 TEST(LayerQuadTest, QuadFConversion)
 {
     gfx::PointF p1(-0.5, -0.5);
     gfx::PointF p2( 0.5, -0.5);
     gfx::PointF p3( 0.5,  0.5);
     gfx::PointF p4(-0.5,  0.5);
 
     gfx::QuadF quadCW(p1, p2, p3, p4);
@@ skipping 12 matching lines @@
     gfx::PointF p3( 0.5,  0.5);
     gfx::PointF p4(-0.5,  0.5);
 
     gfx::QuadF quad(p1, p2, p3, p4);
     LayerQuad layerQuad(quad);
     quad.Scale(2, 2);
     layerQuad.inflate(0.5);
     EXPECT_TRUE(layerQuad.ToQuadF() == quad);
 }
 
-}  // anonymous namespace
+}  // namespace
+}  // namespace cc